28 lines
892 B
C++
28 lines
892 B
C++
#include <limits> /* std::numeric_limits */
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#include "igs_math_random.h"
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//using igs::math::random;
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igs::math::random::random() : seed_(1) {}
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/* 乱数種 seed(0〜std::numeric_limits<long>::max()) */
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void igs::math::random::seed(unsigned long seed) { this->seed_ = seed; }
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unsigned long
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igs::math::random::seed(void) const { return this->seed_; }
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/* 乱数生成 0〜std::numeric_limits<long>::max() */
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long igs::math::random::next(void)
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{
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this->seed_ = this->seed_ * 1103515245UL + 12345UL;
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/* 0x41C64E6D + 0x3039 */
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return static_cast<long>((this->seed_) %
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(static_cast<unsigned long>(std::numeric_limits<long>::max()) + 1UL));
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// /* (this->seed_/ 65536)%32768 */
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// return (this->seed_/0x10000)%0x8000;
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}
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double
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igs::math::random::next_d(void)
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{ /* 0 ... 1 */
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return static_cast<double>(this->next()) /
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static_cast<double>(std::numeric_limits<long>::max());
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}
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